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keyspan_pda: Fix parse error with as31 version 2.3.1 

keyspan_pda.S has an out-of-range decimal constant that looks
like it was really meant to be a binary constant.  Comparing
with the binary, it appears that as31 used to treat this as 0,
so change the source to use 0 and add a comment on this.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Ben Hutchings 2011-08-24 05:40:10 +01:00
parent 5cbed98238
commit 1f2fd14997
1 changed files with 6 additions and 1 deletions
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7
keyspan_pda/keyspan_pda.S
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@ -285,7 +285,12 @@ clear_rx_ring_loop:
mov dptr,OUTC mov dptr,OUTC
movx @dptr, a movx @dptr, a
;; setup the serial port. 9600 8N1. ;; setup the serial port. 9600 8N1.
mov a,#01010011 ; mode 1, enable rx, clear int ;; Original source had:
;;mov a,#01010011 ; mode 1, enable rx, clear int
;; This was presumably meant to be a binary constant, but it's
;; really decimal and out of 8-bit range. as31 used to treat
;; it as 0 and that seems to have worked, so carry on with 0.
mov a,#0
mov SCON, a mov SCON, a
;; using timer2, in 16-bit baud-rate-generator mode ;; using timer2, in 16-bit baud-rate-generator mode
;; (xtal 12MHz, internal fosc 24MHz) ;; (xtal 12MHz, internal fosc 24MHz)